Comparing AWD cars, I own a 2013 Subaru Legacy that runs on regular (H6) and a 2018 Envision on Premium. The cars have the same acceleration. I average (same mix of driving on both cars) about 21 mpg in the Subaru, and just over 25 mpg in the Envision. So each week filling them up, I current spend about $28 on the Buick, and $30 on the Subaru. So while I use premium, I actually spend less in the same driving than the Subaru. We could not get the 4 cylinder subaru because the car did not have enough acceleration for the Merritt Parkway and some of its 50 yard on ramps to get to 55 mph. So a regular car with the same performance getting worse gas mileage costs me more.Just a little update. Well, the car is up to a little over 10K miles now and I have tried numerous types (regular, mid and high-grade versions) and brands of gasoline (all name brands, I checked the GM site for authorized brands). I really feel the performance is best with the high octane fuel even though I am not a hard driver. The car is smoother, has more pep and I hear no engine noise (pinging or otherwise). The upside is I generally get about 25-28 all around driving mileage. The downside is the premium that I have been buying is between $1 to $1.20 more than regular a gallon. Shell today $3.549 @10.397 gallons nets $36.90 which included a $.05 savings per gallon with the Shell card. Still, I am spending less than I did when I had the 3.6L V6 and the performance is almost as good with far better mileage so I fill up far less often.